In this section, we investigate the performance of the considered 3-user bidirectional communication system for the case where \(N_{k}^{(\mathrm {RF})} = M_{q} = 4\) , \(M_{k}^{(\mathrm {RF})}=2\) , \(N_{m}=1\) , and \(N_{k}^{(\mathrm {A})} = M_{k}^{(\mathrm {A})} = \lbrace 16, 128\rbrace \) . We have assumed that the antennas at the FD HBF node \(k\)  are arranged in Uniform Linear Arrays (ULAs) with \(\lambda /2\)  space separation between adjacent elements, where \(\lambda \)  is the wavelength. The distance and angle between the TX and RX ULAs at node \(k\)  were set respectively to \(d = 2\lambda \)  and \(\omega = \pi /6\)  [1]}. The DL and UL channels were simulated as millimeter wave clustered channels, as described in [2]} with pathloss 110dB. In addition, the SI channel was modeled as Rician [2]} with \(K\) -factor 35dB and pathloss 40dB. The RX noise floors at both nodes \(k\)  and \(q\)  were set to \(-110\) dBm, resulting in an effective dynamic range of 62dB for 14-bit ADCs with a 10dB peak-to-average power ratio. Hence, to avoid saturation, the residual SI power after analog cancellation at the input of each RX RF chain needs to be below \(-47\) dBm. Non-ideal \(N\) -tap analog cancellation has been considered as in [4]}, and for the analog TX/RX beamformers, we have used beam codebooks based on the discrete Fourier transform matrix.
